WO2023090691A1 - Dispositif de chauffage par induction à micro-ondes à polarisation circulaire - Google Patents

Dispositif de chauffage par induction à micro-ondes à polarisation circulaire Download PDF

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Publication number
WO2023090691A1
WO2023090691A1 PCT/KR2022/016861 KR2022016861W WO2023090691A1 WO 2023090691 A1 WO2023090691 A1 WO 2023090691A1 KR 2022016861 W KR2022016861 W KR 2022016861W WO 2023090691 A1 WO2023090691 A1 WO 2023090691A1
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Prior art keywords
microwave
circularly polarized
induction heating
heating device
microwaves
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PCT/KR2022/016861
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English (en)
Korean (ko)
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김대호
신지원
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한국전기연구원
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/647—Aspects related to microwave heating combined with other heating techniques
    • H05B6/6488—Aspects related to microwave heating combined with other heating techniques combined with induction heating
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/70—Feed lines
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/70—Feed lines
    • H05B6/704—Feed lines using microwave polarisers
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/76—Prevention of microwave leakage, e.g. door sealings

Definitions

  • the present invention relates to a microwave induction heating device, and more particularly, to a microwave heating device for heating a conductive material by generating an induced current using a circularly polarized microwave magnetic field.
  • Microwave is a type of electromagnetic wave, also called microwave, which has a wavelength of 1 mm to 1 m and a frequency of 300 MHz to 300 GHz. Microwaves were developed for radar during World War II, and have since been widely used in communication devices. In particular, its utilization is increasing in mobile phones, wireless LANs, and the like. In 1946, while developing radar, it was accidentally discovered that microwaves rapidly heat food, which led to the invention of the microwave oven.
  • Microwave heating technology has been developed as an industrial heating method as well as household use. In the mid-1980s, microwave heating began to be applied to chemical analysis, that is, ashing, extraction, and digestion. It was reported that the reaction occurred about 1000 times faster. In the 1990s, products developed by microwave chemical device manufacturers became widely available as they developed technologically.
  • the dipolar polarization heating mechanism is a process in which heat is generated from polar molecules and is a principle of dielectric heating.
  • polar molecules try to align with the direction and phase of the electric field under an electric field oscillating at an appropriate frequency, the intermolecular force resists the polar molecules and prevents them from following the electric field, resulting in random motion of the molecules, which generates heat.
  • This exothermic mechanism can effectively heat water, organic solvents, oxides, and the like.
  • the electric resistance heating mechanism is a principle in which heat is generated due to resistance to current.
  • An oscillating electric field causes electrons or ions to oscillate in a conductor, creating an electric current, which generates heat due to internal resistance.
  • This heating principle is based on the flow of current generated by an electric field, and can be referred to as conduction heating.
  • This microwave conduction heating can occur when a microwave electric field is applied to a non-dielectric conductive material having polar molecules such as water or an organic solvent.
  • a conductive material is present in the microwave resonator, the electromagnetic field distribution in the resonator is greatly affected by the material's conductivity value or size shape.
  • Existing induction heating technology as a tool for heating conductive materials such as metals can heat a nearby metal by generating an induced current when a magnetic field is created by winding a coil through which a current with a frequency of several tens of kHz flows. there is.
  • the metal has magnetism, it can be heated more effectively by hysteresis loss.
  • This induction heating is widely used in industry as a heat treatment of metal or a high-temperature melting furnace, and is widely used as a cooking utensil at home.
  • the penetration depth of the induced current generated in the metal surface in induction heating has a close correlation with the conductivity of the metal, and the higher the frequency of induction heating, the lower the penetration depth.
  • the penetration depth of the induced current into metal has a value of about 1 mm, so it is suitable for heating materials having a millimeter level thickness, such as cooking utensils.
  • the thin conductive material of the order of 1 ⁇ m or less is much thinner than the penetration depth of the induced current due to the frequency of tens to hundreds of kHz, the magnetic field hardly creates the induced current in the conductive material and passes through it.
  • the microwave induction heating technology proposed to solve this problem is a new induction heating technology that heats a conductive material using a microwave band magnetic field used in a microwave oven. Since the penetration depth of the induced current formed on the metal surface due to microwaves in the frequency band used in microwave ovens is about 1 ⁇ m, it is a technology suitable for heating very thin thin films of several micrometers or less or nanometer level. Microwave induction heating technology not only can selectively and directly heat only thin film-type conductive materials that require heat, but also has a high conversion efficiency of about 70% from electrical energy to thermal energy, so it is very efficient and fast without wasting thermal energy. It is a technology that can be heated.
  • a general microwave induction heating device 10 may include a microwave input unit 11, a microwave coupler 12, a dielectric resonator 13, and a microwave body 14.
  • the microwave magnetic field resonating through the dielectric resonator 13 is only in a certain direction. It vibrates, and as a result, the induced current formed in the conductive material 5 in the form of a thin film also has a characteristic of being formed only in a certain direction.
  • conductive materials in the form of thin films formed in most electronic devices often have micrometer-sized or smaller patterns in order to perform necessary functions, and the conductive materials themselves are made of nanomaterials such as nanowires. Current flow also occurs only on nanomaterials.
  • an induced current is generated by applying the conventional microwave induction heating device 10 to such a thin-film conductive material, only the pattern structure or nanostructure formed in the same direction is strongly heated because the direction of the induced current is constant.
  • microwave induction heating has a tremendous heating capacity of more than 100,000 degrees per second, stress due to extreme temperature difference between internal regions of conductive material when only some pattern structures or nanostructures are heated first damage is easily caused by Therefore, it is necessary to develop a microwave induction heating technology capable of uniformly heating the entire thin film regardless of the shape of the pattern structure or nanostructure constituting the thin film type conductive material.
  • the present invention aims to solve the foregoing and other problems. Another object is to provide a circularly polarized microwave induction heating device capable of uniformly heating a conductive material made of a structure or nanostructure in a predetermined pattern as a whole by using a circularly polarized microwave magnetic field generated through a dielectric resonator.
  • a circularly polarized microwave supply unit for supplying circularly polarized microwaves; a dielectric resonator generating a circularly polarized microwave magnetic field by resonating the circularly polarized microwave received from the circularly polarized microwave supply unit and generating a circularly polarized induced current in a conductive material using the circularly polarized microwave magnetic field; and a microwave body portion disposed to surround the dielectric resonator and to block external leakage of the circularly polarized microwaves.
  • a microwave generator for generating microwaves; first and second waveguides for transmitting the microwave; a circular polarization converter disposed inside the second waveguide to convert the microwaves into circularly polarized microwaves; a dielectric resonator generating a circularly polarized microwave magnetic field based on the circularly polarized microwave and generating a circularly polarized induced current in a conductive material using the circularly polarized microwave magnetic field; and a microwave body portion disposed to surround the dielectric resonator and to block external leakage of the circularly polarized microwaves.
  • Circularly polarized microwave induction heating apparatus rotates at the frequency speed of microwaves on the surface of a conductive material made of a structure or nanostructure of a certain pattern using a circularly polarized microwave magnetic field generated through a dielectric resonator A circularly polarized induced current may be generated to uniformly heat the conductive material as a whole.
  • the circularly polarized microwave induction heating device can selectively heat conductive materials having a very thin thickness of less than a micrometer level, such as conductive thin films and fine wires, conductive fibers, and chip devices having thin film electrodes. Because only a very small amount of conductive material that needs to be heated is selectively heated, it can be heated to a much higher temperature with much less energy and at a much faster rate.
  • the circular polarization microwave induction heating device not only significantly improves the speed of the heat treatment process, but also lowers production costs by reducing energy consumption, and can maintain a much lower ambient temperature, enabling heat treatment of materials that cannot be heated at high temperatures. it does
  • FIG. 1 is a view showing a microwave induction heating apparatus according to the prior art
  • FIG. 2 is a diagram showing a circularly polarized microwave induction heating device according to a first embodiment of the present invention
  • FIG. 3 is a view showing a circularly polarized microwave induction heating device according to a second embodiment of the present invention.
  • FIG. 4 is a view showing a circularly polarized microwave induction heating device according to a third embodiment of the present invention.
  • 5A to 5B are diagrams illustrating an example of a model simulating a circularly polarized microwave induction heating device according to embodiments of the present invention.
  • 5C is a diagram illustrating a circularly polarized microwave magnetic field generated in the circularly polarized microwave induction heating device of FIG. 5A;
  • Fig. 5d is a diagram illustrating a circularly polarized induced current caused by the circularly polarized microwave induction heating apparatus of Fig. 5a;
  • FIGS. 6A to 6B are diagrams illustrating another example of a model simulating a circularly polarized microwave induction heating device according to embodiments of the present invention.
  • FIG. 7 is a view showing a circularly polarized microwave induction heating device according to a fourth embodiment of the present invention.
  • the present invention proposes a circularly polarized microwave induction heating device capable of uniformly heating a conductive material made of a structure or nanostructure in a predetermined pattern as a whole by using a circularly polarized microwave magnetic field generated through a dielectric resonator.
  • a circularly polarized microwave induction heating device capable of uniformly heating a conductive material made of a structure or nanostructure in a predetermined pattern as a whole by using a circularly polarized microwave magnetic field generated through a dielectric resonator.
  • FIG. 2 is a diagram showing a circularly polarized microwave induction heating device according to a first embodiment of the present invention.
  • a circularly polarized microwave induction heating device 100 may include a circularly polarized microwave supply unit 110, a dielectric resonator 120, and a microwave body 130. . Meanwhile, although not shown in the drawing, the circularly polarized microwave induction heating device 100 may further include a control device for controlling operations related to the above-described components 110 to 130.
  • the circularly polarized microwave supply unit 110 may generate circularly polarized microwaves 115 and supply the generated circularly polarized microwaves 115 toward the dielectric resonator 120 .
  • the circularly polarized microwave supply unit 110 may include a microwave generator, a microwave input unit, and a microwave coupler.
  • the circularly polarized microwave supply unit 110 may be installed in one area of the microwave body 130 . Also, the circularly polarized microwave supply unit 110 may be disposed in an area adjacent to the dielectric resonator 120 .
  • the dielectric resonator 120 generates an electromagnetic field pattern for microwave induction heating based on microwaves supplied from the outside to generate an induced current 55 in the object to be heated (ie, the conductive material 50). . At this time, the dielectric resonator 120 may generate an electric field pattern and a magnetic field pattern in a basic resonance mode.
  • the electromagnetic field pattern of the basic resonance mode created by the dielectric resonator 120 consists of an electric field pattern rotating about the central axis of the dielectric resonator 120 and a magnetic field pattern coming out along the central axis, returning to the outside, and returning to the central axis. .
  • the electric field pattern has a value of 0 at the central axis and almost disappears as it approaches 0 when it is dropped to the outside of the dielectric resonator 120 by a certain distance or more.
  • the most important fact in implementing microwave induction heating using the dielectric resonator 120 is that the electric field pattern mainly exists in the form of a rotating loop within the dielectric resonator 120, and the magnetic field pattern comes out through the central axis to the outside. The point is that it exists in the form of a loop that spreads around and returns to the central axis. Due to this, the outer or central axis of the dielectric resonator 120 becomes a region where an electric field does not exist and a strong and uniform magnetic field exists.
  • the overall shape of the dielectric resonator 120 may be formed in a column shape such as a cylinder, a rectangular parallelepiped, or a regular hexahedron. Meanwhile, according to an embodiment of the present invention, a through hole (not shown) for inserting the conductive material 50 may be formed in the central portion of the dielectric resonator 120 .
  • the dielectric resonator 120 may resonate the circularly polarized microwave 115 received from the circularly polarized microwave supply unit 110 to generate a circularly polarized microwave magnetic field 125 as shown in the drawing.
  • the dielectric resonator 120 may generate a circularly polarized induced current 55 on the surface of the conductive material 50 using the circularly polarized microwave magnetic field 125 .
  • the circularly polarized microwave magnetic field 125 and the induced current 55 rotate at the frequency speed of the microwave. Accordingly, the circularly polarized induced current 55 can uniformly heat the entire conductive material 50 made of a structure or nanostructure in a predetermined pattern.
  • the microwave body 130 may be disposed to surround the dielectric resonator 120 to block external leakage of circularly polarized microwaves.
  • the overall shape of the microwave body 130 may be formed in a columnar shape such as a cylinder, a rectangular parallelepiped, or a regular hexahedron. Also, the microwave body 130 may be formed of a metal material.
  • the controller may control the overall operation of the circularly polarized microwave induction heating device 100 .
  • the controller may perform a function of adjusting the resonance frequency of the electromagnetic field in the resonance mode of the dielectric resonator 120 by adjusting the separation distance between the dielectric resonator 120 and the microwave body 130 .
  • the circularly polarized microwave induction heating device uses a circularly polarized microwave magnetic field generated through a dielectric resonator to make a structure having a certain pattern or a conductive material made of nanostructures uniform throughout. can be heated
  • FIG. 3 is a diagram showing a circularly polarized microwave induction heating device according to a second embodiment of the present invention.
  • a circularly polarized microwave induction heating device 200 includes first and second microwave generators 210 and 220, a phase difference controller 230, and first and second microwaves. It may include input units 240 and 250 , first and second microwave couplers 260 and 270 , a dielectric resonator 280 , a microwave body 290 and a blocking resonator 295 . Meanwhile, although not shown in the drawing, the circularly polarized microwave induction heating apparatus 200 may further include a control device for controlling operations related to the above-described components 210 to 295 .
  • the dielectric resonator 280 and the microwave body 290 of the circularly polarized microwave induction heating device 200 are the same as or similar to the dielectric resonator 120 and the microwave body 130 of FIG. 2 described above, a detailed description thereof omit it.
  • the first microwave generator 210 may generate first microwaves 215 having a first phase and provide the generated first microwaves 215 to the first microwave input unit 240 .
  • the second microwave generator 220 may generate second microwaves 225 having a second phase and provide the generated second microwaves 225 to the second microwave input unit 240 .
  • the phase difference controller 230 may control the first and second microwave generators 210 and 220 so that the phase difference between the first microwave 215 and the second microwave 225 has a predetermined angle (eg, 90 degrees). there is. That is, the first microwave 215 generated through the first microwave generator 210 and the second microwave 225 generated through the second microwave generator 220 have a constant phase difference (eg, 90 degrees). It can be. A phase difference between the first and second microwaves 215 and 225 may be used to generate circularly polarized microwaves.
  • the first microwave input unit 240 may perform a function of transmitting the first microwave 215 received from the first microwave generator 210 to the first microwave coupler 260 .
  • the first microwave input unit 240 may be disposed in one area of the microwave body 290 .
  • the second microwave input unit 250 may perform a function of transmitting the second microwave 225 received from the second microwave generator 220 to the second microwave coupler 270 .
  • the second microwave input unit 250 may be disposed in one area of the microwave body 290 .
  • the first and second microwave input units 240 and 250 may have a coaxial waveguide shape.
  • the first and second microwave input units 240 and 250 may be in the form of coaxial waveguides coupled to one region of the microwave body 290 .
  • the first and second microwave input units 240 and 250 may be used in the form of a square or circular waveguide.
  • the shapes of the first and second microwave input units 240 and 250 are preferably determined according to the shapes of the first and second microwave couplers 260 and 270 .
  • the first microwave coupler 260 is coupled to the first microwave input unit 240 and performs a function of transferring the first microwave 215 received from the first microwave input unit 240 to the dielectric resonator 280.
  • the first microwave coupler 260 may be formed to extend in a straight line along the longitudinal direction of the first microwave input unit 240 . Meanwhile, in another embodiment, the first microwave coupler 260 may be formed to extend in a direction perpendicular to the longitudinal direction of the first microwave input unit 240 .
  • the second microwave coupler 270 is coupled to the second microwave input unit 250 and performs a function of transferring the second microwave 225 received from the second microwave input unit 250 to the dielectric resonator 280.
  • the second microwave coupler 270 may be formed to extend in a straight line along the longitudinal direction of the second microwave input unit 250 . Meanwhile, in another embodiment, the second microwave coupler 270 may be formed to extend in a direction perpendicular to the longitudinal direction of the second microwave input unit 250 .
  • the first and second microwave couplers 260 and 270 may be disposed at an angle corresponding to a phase difference between the first and second microwaves 215 and 225 with respect to the central axis of the dielectric resonator 280 . This is to generate circularly polarized microwaves through the phase difference between the first and second microwaves 215 and 225 and the arrangement structure of the first and second microwave couplers 260 and 270 .
  • the first and second microwave couplers 260 and 270 may be loop-shaped metals or rod-shaped metals spaced apart from the dielectric resonator 280 by a predetermined distance, but are not necessarily limited thereto.
  • the dielectric resonator 280 may resonate circularly polarized microwaves received from the first and second microwave couplers 260 and 270 to generate a circularly polarized microwave magnetic field 285 as shown in the drawing.
  • the dielectric resonator 280 may generate a circularly polarized induced current 55 on the surface of the conductive material 50 using the circularly polarized microwave magnetic field 285 .
  • the circularly polarized microwave magnetic field 285 and the induced current 55 rotate at the frequency speed of the microwave. Accordingly, the circularly polarized induced current 55 can uniformly heat the entire conductive material 50 made of a structure or nanostructure in a predetermined pattern.
  • the microwave body 290 may be disposed to surround the dielectric resonator 280 to block external leakage of circularly polarized microwaves.
  • the blocking resonator 295 blocks external leakage of circularly polarized microwaves through an open space between the inside and outside of the microwave body 290, that is, a space between the conductive material 50 and the microwave body 290.
  • the blocking resonator 295 is a cavity resonator or waveguide that can be coupled around an open space communicating between the inside and outside of the microwave body 290 around a path where the object to be heated 50 is loaded or unloaded.
  • the cavity resonator may be designed to have a resonance frequency higher than the frequency of the microwave
  • the waveguide may be designed to have a waveguide cutoff frequency higher than the frequency of the microwave.
  • the blocking resonator 295 corresponds to a choke cavity type cavity resonator or waveguide that prevents microwaves of a specific frequency from passing therethrough.
  • a cavity resonator or waveguide may include a form in which a plurality of metal rods (or rods) for cavity resonance are arranged one-dimensionally or two-dimensionally on a fixed plate.
  • the blocking resonator 295 may be omitted.
  • the controller may control the overall operation of the circularly polarized microwave induction heating device 200 .
  • the controller may perform a function of adjusting the resonance frequency of the electromagnetic field in the resonance mode of the dielectric resonator 280 by adjusting the separation distance between the microwave body 290 and the dielectric resonator 280 .
  • the control device may adjust the amount of microwave transmitted to the dielectric resonator 280 by adjusting the separation distance between the first and second microwave couplers 260 and 270 and the dielectric resonator 280 .
  • the circularly polarized microwave induction heating device uses a circularly polarized microwave magnetic field generated through a dielectric resonator to make a structure having a certain pattern or a conductive material made of nanostructures uniform throughout. can be heated
  • FIG. 4 is a diagram showing a circularly polarized microwave induction heating device according to a third embodiment of the present invention.
  • a circularly polarized microwave induction heating device 300 includes a microwave generator 310, a microwave distributor 320, first and second microwave input units 330 and 340, It may include first and second microwave couplers 350 and 360 , a dielectric resonator 370 , a microwave body 380 and a blocking resonator 390 . Meanwhile, although not shown in the drawing, the circularly polarized microwave induction heating apparatus 300 may further include a control device for controlling operations related to the above-described components 310 to 390.
  • the first and second microwave couplers 350 and 360, the dielectric resonator 370, the microwave body 380, and the blocking resonator 390 of the circularly polarized microwave induction heating device 300 are the first and second microwave couplers 350 and 360 of FIG. Since the second microwave couplers 260 and 270, the dielectric resonator 280, the microwave body 290, and the blocking resonator 295 are the same as or similar to each other, a detailed description thereof will be omitted.
  • the microwave generator 310 may generate one microwave 315 and provide the generated microwave 315 to the microwave distributor 320 .
  • the microwave splitter 320 may distribute (branch) the microwave received from the microwave generator 310 into first and second microwaves, and provide the same to the first and second microwave input units 330 and 340 .
  • the first microwave input unit 330 may perform a function of transmitting the first microwave received from the microwave splitter 320 to the first microwave coupler 350 .
  • the first microwave input unit 330 may be disposed in one area of the microwave body 380 .
  • the second microwave input unit 340 may perform a function of transmitting the second microwave received from the microwave splitter 320 to the second microwave coupler 360 .
  • the second microwave input unit 340 may be disposed in one area of the microwave body 380 .
  • the first and second microwave input units 330 and 340 may have a coaxial waveguide shape.
  • the first and second microwave input units 330 and 340 may be in the form of coaxial waveguides coupled to one region of the microwave body 380 .
  • the first and second microwave input units 330 and 340 may be used in the form of square or circular waveguides.
  • the first and second microwave input units 330 and 340 may have different lengths. This is to generate a phase difference between the first and second microwaves through the length difference between the first and second microwave input units 330 and 340 . That is, the first microwave transmitted through the first microwave input unit 330 and the second microwave transmitted through the second microwave input unit 340 may have a constant phase difference (eg, 90 degrees). A phase difference between the first and second microwaves may be used to generate circularly polarized microwaves.
  • the first microwave coupler 350 may be coupled to the first microwave input unit 330 to transmit the first microwave received from the first microwave input unit 330 to the dielectric resonator 370 .
  • the second microwave coupler 360 may be coupled to the second microwave input unit 340 and transfer the second microwave received from the second microwave input unit 340 to the dielectric resonator 370 .
  • the first and second microwave couplers 350 and 360 may be disposed at an angle corresponding to a phase difference between the first and second microwaves with respect to the central axis of the dielectric resonator 370 . This is to generate circularly polarized microwaves through the phase difference between the first and second microwaves and the arrangement structure of the first and second microwave couplers 350 and 360 .
  • the dielectric resonator 370 may resonate circularly polarized microwaves received from the first and second microwave couplers 350 and 360 to generate a circularly polarized microwave magnetic field 375 as shown in the drawing.
  • the dielectric resonator 370 may generate a circularly polarized induced current 55 on the surface of the conductive material 50 using the circularly polarized microwave magnetic field 375 .
  • the circularly polarized microwave magnetic field 375 and the induced current 55 rotate at the frequency speed of the microwave. Accordingly, the circularly polarized induced current 55 can uniformly heat the entire conductive material 50 made of a structure or nanostructure in a predetermined pattern.
  • the microwave body 380 may be disposed to surround the dielectric resonator 370 to block external leakage of circularly polarized microwaves.
  • the blocking resonator 390 blocks external leakage of circularly polarized microwaves through an open space between the inside and outside of the microwave body 380, that is, a space between the conductive material 50 and the microwave body 380. can be done Meanwhile, according to an embodiment of the present invention, the blocking resonator 390 may be omitted.
  • the controller may control the overall operation of the circularly polarized microwave induction heating device 300 .
  • the controller may perform a function of adjusting the resonance frequency of the electromagnetic field in the resonance mode of the dielectric resonator 370 by adjusting the distance between the microwave body 380 and the dielectric resonator 370 .
  • the controller may adjust the amount of microwaves transmitted to the dielectric resonator 370 by adjusting the separation distance between the first and second microwave couplers 350 and 360 and the dielectric resonator 370 .
  • the circularly polarized microwave induction heating device uses a circularly polarized microwave magnetic field generated through a dielectric resonator to make a structure having a certain pattern or a conductive material made of nanostructures uniform throughout. can be heated
  • FIG. 5a and 5b are diagrams illustrating an example of a model simulating a circularly polarized microwave induction heating device according to embodiments of the present invention
  • FIG. 5c is a circularly polarized microwave generated in the circularly polarized microwave induction heating device of FIG. 5a.
  • FIG. 5D is a diagram illustrating a circularly polarized induced current caused by the circularly polarized microwave induction heating apparatus of FIG. 5A.
  • the circularly polarized microwave induction heating apparatus 500 includes first and second microwave input units 510 and 520, first and second microwave couplers 530 and 540 ), a dielectric resonator 550 and a microwave body 560.
  • the first microwave input unit 510 may perform a function of transmitting the first microwave to the first microwave coupler 530 .
  • the first microwave input unit 510 may have a coaxial waveguide structure.
  • the second microwave input unit 520 may perform a function of transmitting the second microwave to the second microwave coupler 540 .
  • the second microwave input unit 520 may also have a coaxial waveguide structure.
  • the first microwave generated through the first microwave generator 510 and the second microwave generated through the second microwave generator 520 may have a constant phase difference (eg, 90 degrees).
  • the first microwave coupler 530 may perform a function of transferring the first microwave received from the first microwave input unit 510 to the dielectric resonator 550 .
  • the first microwave coupler 530 may be formed to extend in a direction perpendicular to the longitudinal direction of the first microwave input unit 510 . Meanwhile, in another embodiment, as shown in FIG. 6A , the first microwave coupler 530 may be formed to extend in a straight line along the longitudinal direction of the first microwave input unit 510 .
  • the second microwave coupler 540 may perform a function of transferring the second microwave received from the second microwave input unit 520 to the dielectric resonator 550 .
  • the second microwave coupler 540 may be formed to extend in a direction perpendicular to the longitudinal direction of the second microwave input unit 520 . Meanwhile, in another embodiment, as shown in FIG. 6A , the second microwave coupler 540 may be formed to extend in a straight line along the longitudinal direction of the second microwave input unit 520 .
  • the first and second microwave couplers 530 and 540 may be disposed at an angle corresponding to a phase difference between the first and second microwaves with respect to the central axis of the dielectric resonator 550 .
  • the first and second microwave couplers 530 and 540 are mutually connected with respect to the central axis of the dielectric resonator 550. It may be formed to be disposed at an angle of 90 degrees. This is to generate circularly polarized microwaves through the phase difference between the first and second microwaves and the arrangement structure of the first and second microwave couplers 530 and 540 .
  • the dielectric resonator 550 may generate a circularly polarized microwave magnetic field by resonating circularly polarized microwaves received from the first and second microwave couplers 530 and 540 .
  • the dielectric resonator 550 may generate circularly polarized microwaves 570 that rotate while the phase continuously changes over time.
  • the dielectric resonator 550 may generate a circularly polarized induced current 55 on the surface of the conductive material 50 using the circularly polarized microwave magnetic field 570 .
  • the dielectric resonator 550 may generate a circularly polarized induced current 580 that rotates while the phase continuously changes over time. Accordingly, the circularly polarized induced current 580 can uniformly heat the entire conductive material 50 made of a structure or nanostructure in a predetermined pattern.
  • the microwave body 560 may be disposed to surround the dielectric resonator 550 to block external leakage of circularly polarized microwaves.
  • FIG. 7 is a diagram showing a circularly polarized microwave induction heating device according to a fourth embodiment of the present invention.
  • a circularly polarized microwave induction heating device 600 includes a microwave generator 610, a first waveguide 620, a waveguide mode converter 630, and a second waveguide 640. ), a circular polarization converter 650, a microwave coupler 660, a dielectric resonator 670, a microwave body 680, and a blocking resonator 690. Meanwhile, although not shown in the drawings, the circularly polarized microwave induction heating device 600 may further include a control device for controlling operations related to the above-described components 610 to 690 .
  • the dielectric resonator 670, the microwave body 680, and the blocking resonator 690 of the circularly polarized microwave induction heating device 600 are the dielectric resonator 370, the microwave body 380, and the blocking resonator ( 390), so a detailed description thereof will be omitted.
  • the microwave generator 610 may generate one microwave 615 and supply the generated microwave 615 to the first waveguide 620 .
  • the microwaves are linearly polarized microwaves.
  • the first waveguide 620 may transmit microwaves 615 received from the microwave generator 610 to the second waveguide 340 .
  • the first waveguide 620 may be a rectangular waveguide, but is not necessarily limited thereto.
  • the microwave magnetic field 625 generated by the first waveguide 620 is a linearly polarized microwave magnetic field.
  • the waveguide mode converter 630 is disposed between the first waveguide 620 and the second waveguide 640 to transfer the microwave 615 from the first waveguide 620 to the second waveguide 640 without loss. function can be performed.
  • the second waveguide 640 may transmit the microwave 615 received from the first waveguide 620 to the microwave coupler 660 .
  • the second waveguide 640 may be a circular waveguide, but is not necessarily limited thereto.
  • the first waveguide 620, the waveguide mode converter 630, and the second waveguide 640 may be formed of a metal material.
  • the first waveguide 620, the waveguide mode converter 630, and the second waveguide 640 may be integrally formed.
  • the circular polarization converter 650 may be disposed inside the second waveguide 640 to convert linearly polarized microwaves 625 into circularly polarized microwaves 655 .
  • the circular polarization converter 650 may be formed in a plate shape of a dielectric material having ⁇ /4.
  • the circular polarization converter 650 converts the linearly polarized microwaves 625 into circularly polarized microwaves 655 by arranging them at an angle of 45 degrees to the electric field direction of the linearly polarized microwaves 625 input to the second waveguide 640. can do.
  • the microwave coupler 660 may perform a function of transferring circularly polarized microwaves 655 received from the second waveguide 640 to the dielectric resonator 670 .
  • the microwave coupler 660 may be formed to extend in a direction perpendicular to the longitudinal direction of the second waveguide 640 .
  • the microwave coupler 660 may be disposed between the second waveguide 640 and the microwave body 680 .
  • the microwave coupler 660 may be formed in a ring shape having a circular opening in the center.
  • the dielectric resonator 670 may generate a circularly polarized microwave magnetic field by resonating circularly polarized microwaves received from the microwave coupler 660 .
  • the dielectric resonator 670 may generate a circularly polarized induced current 55 on the surface of the conductive material 50 by using a circularly polarized microwave magnetic field. Accordingly, the circularly polarized induction current 55 rotating at the frequency speed of the microwave can uniformly heat the conductive material 50 as a whole regardless of the pattern of the conductive material 50 .
  • the microwave body 680 may be disposed to surround the dielectric resonator 670 to block external leakage of circularly polarized microwaves.
  • the blocking resonator 690 blocks external leakage of circularly polarized microwaves in the open space between the inside and outside of the microwave body 680, that is, the space between the conductive material 50 and the microwave body 680. can do.
  • the circularly polarized microwave induction heating device uses a circularly polarized microwave magnetic field generated through a circularly polarized converter and a dielectric resonator to conduct a pattern of structures or nanostructures.
  • the material can be heated uniformly throughout.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Waveguide Aerials (AREA)

Abstract

La présente invention concerne un dispositif de chauffage par induction à micro-ondes à polarisation circulaire comprenant : une unité d'alimentation en micro-ondes à polarisation circulaire pour fournir des micro-ondes à polarisation circulaire; un résonateur diélectrique qui amène la micro-onde à polarisation circulaire reçue à partir de l'unité d'alimentation en micro-ondes à polarisation circulaire résonnent de manière à générer un champ magnétique de micro-ondes à polarisation circulaire, et qui utilise le champ magnétique de micro-ondes à polarisation circulaire de façon à générer un courant d'induction à polarisation circulaire dans un matériau conducteur; et une unité de corps à micro-ondes qui est agencée pour englober le résonateur diélectrique, et qui bloque une fuite externe des micro-ondes à polarisation circulaire.
PCT/KR2022/016861 2021-11-16 2022-11-01 Dispositif de chauffage par induction à micro-ondes à polarisation circulaire WO2023090691A1 (fr)

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KR10-2021-0157779 2021-11-16

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100729909B1 (ko) * 1999-11-03 2007-06-18 테크놀러지 파이낸스 코퍼레이션(프로프리어터리) 리미티드 유전 가열 장치
WO2013018358A1 (fr) * 2011-08-04 2013-02-07 パナソニック株式会社 Dispositif de chauffage par micro-ondes
KR20150136781A (ko) * 2014-05-28 2015-12-08 삼성전자주식회사 마이크로파 가열 장치 및 마이크로파 가열 장치의 제어 방법
KR20160107924A (ko) * 2015-03-06 2016-09-19 서강대학교산학협력단 마이크로파 근접장 가열을 통한 근접장 영상화 현미경
KR20210012403A (ko) * 2019-07-25 2021-02-03 한국전기연구원 마이크로파 대역의 유도 가열 장치

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100729909B1 (ko) * 1999-11-03 2007-06-18 테크놀러지 파이낸스 코퍼레이션(프로프리어터리) 리미티드 유전 가열 장치
WO2013018358A1 (fr) * 2011-08-04 2013-02-07 パナソニック株式会社 Dispositif de chauffage par micro-ondes
KR20150136781A (ko) * 2014-05-28 2015-12-08 삼성전자주식회사 마이크로파 가열 장치 및 마이크로파 가열 장치의 제어 방법
KR20160107924A (ko) * 2015-03-06 2016-09-19 서강대학교산학협력단 마이크로파 근접장 가열을 통한 근접장 영상화 현미경
KR20210012403A (ko) * 2019-07-25 2021-02-03 한국전기연구원 마이크로파 대역의 유도 가열 장치

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